- Nov 30, 2018
- El Mirage, AZ
Ok, kind of long description but trying to be as throught as I can. My recently acquired 98 Contour SVT has a bad problem with throttle hang. It's throwing a check engine light for code p1120 (tps, ratch too low) and when first starting it up it runs ok but seems as it warms up it gets continually worse. At first the revs drop like normal, then it starts to not drop revs for 3-5 seconds or until I slow down to about 5 mph, then it starts to have the revs raise in neutral for 15-20 seconds up to around 4k rpm. I've reset the ECU, cleaned and tested the idle air control valve, replaced the TPS, cleaned the throttle body, and now at a loss what is causing the problem. The data logging for the throttle position sensor shows that the level it detects when the throttle is at idle seems to step/raise up the longer I drive. Starting at 6% throttle at idle (during which it runs fine) going up to around 7% (throttle hangs a little but drops after a few seconds) then jumping up to around 17% (revs going up to 4k in neutral with foot off the gas and wanting to stay there for about 15 sec.) Any help is greatly appreciated!